crypto: tcrypt - fix S/G table for test_aead_speed()

In case buffer length is a multiple of PAGE_SIZE,
the S/G table is incorrectly generated.
Fix this by handling buflen = k * PAGE_SIZE separately.
Signed-off-by: Robert Baronescu <robert.baronescu@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

crypto/tcrypt.c

@@ -198,10 +198,12 @@ static void sg_init_aead(struct scatterlist *sg, char *xbuf[XBUFSIZE],
 	}
 
 	sg_init_table(sg, np + 1);
+	if (rem)
 		np--;
 	for (k = 0; k < np; k++)
 		sg_set_buf(&sg[k + 1], xbuf[k], PAGE_SIZE);
 
+	if (rem)
 		sg_set_buf(&sg[k + 1], xbuf[k], rem);
 }